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At M-Spin we talk a lot about electrolysis and green hydrogen production - and indeed, this is one of our major focus markets. But electrolysis is far from the only use of M-Spin materials, with one particularly important application being batteries. This article explores how M-Spin materials can be used in batteries, which segments of the battery market are a particularly good fit for our materials, and how the properties of M-Spin materials can drive breakthrough performance in these segments. Batteries – The innovation opportunity From the early days of the portable electronics revolution in the 90’s, to more recent applications in electric vehicles (EVs) and grid storage, rechargeable technologies such as Li-ion batteries have become ubiquitous in modern life. This trend is only going to accelerate with the global shift to an electrified, decarbonised society – batteries are a crucial enabler for renewable energy generation, storing excess energy at peak generation and releasing energy at times of high demand. Indeed, the cost of solar power combined with energy storage is cheaper than coal and nuclear power generation in the sunniest parts of the world, with prices dropping >20% within the past year alone. [1] However, there continues to be a need to make batteries smaller, lighter and cheaper to make, to further accelerate their integration and adoption worldwide and improve the profit margins of cell manufacturers. It’s important to discuss the basic structure of a battery before we can understand how to improve them. Conventional batteries such as Li-ion batteries resemble a lasagne - built from multiple layers of anodes and cathodes (electrodes), which are adhered to current collectors (Cu for anodes and Al for cathodes). The anodes and cathodes are layered between separators (a porous polymer membrane ) and the entire stack is saturated with electrolyte – the “sauce” of the battery that allows lithium to flow through the cell. When the cell is charged or discharged, Li shuttles between the anodes and cathodes, either releasing or storing energy depending on the direction of the flow. The current collectors allow an electric current to flow into the anodes and cathodes. This battery structure can provide power, reversibly, over thousands of charge and discharge cycles. [1] https://ember-energy.org/app/uploads/2025/06/Ember-24-Hour-Solar-Electricity-June-2025-6.pdf